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Halcyon API

Energy market intelligence, at record speed

Halcyon’s API lets you build on the intel powering the energy buildout

Get API access Read the docs
“Halcyon’s API helped me find things I didn’t even know I was looking for”
Data Center Developer
Aska question across filings

Which utilities have a large load tariff pending, and what minimum contract term does each propose?

Answerin your fields, cited to the page
utilitymin_termsource DTE Electric · MI15 yearsReply Brief, p. 21Duke Energy Carolinas · NC10 yearsInitial Comments, p. 21Public Service Co. of Colorado15 yearsAnswer Testimony, p. 33Oklahoma Gas & Electric · OK15 yearsResponsive Testimony, p. 11

Live result from the Halcyon API, November 2026

Benefits

The regulatory record updates every day. Your systems should too.

Keep pace with the buildout

Commissions, grid operators and permitting agencies publish around the clock. Now you programmatically access this data on your schedule.

Pull Halcyon data inside your systems

Automate enrichment in your CRM, data warehouse, GIS layers and financial models with the latest docket, tariff, permit and project data.

Streamline your team's workflows

Integrate Halcyon's data with your existing toolkit to build docket deadline calendars, pipeline trackers, lead lists, and executive presentations.

Search wider and dive deeper, faster

Have machines iteratively search and query across thousands of filings while you focus on other work.

Structured answers
Name the fields you want. Query answers come back in that shape, ready to load.
Cited to the page
Every value links to its source document and page for rapid verification.
Your context, amplified
Enrich your proprietary data with Halcyon output and additional context
Always-on collection
We add new data daily and continuously add new data sources.

Use cases

Build faster, work smarter

Track · Organize

Feed your systems

Build pipeline and stay ahead of procedural deadlines, inside the tools your team already uses.

Usecase 01
  • CRM lead lists
  • Docket deadline calendar
  • GIS and warehouse enrichment

Monitor · Verify · Backstop

Watch a market continuously

Know which projects are moving through permitting, not just sitting in the queue, and what’s happening in the markets where you’re not active.

Usecase 02
  • ERCOT Batch Zero pipeline
  • Data center air permits
  • Rate case tracking

Segment · Budget · Summarize

Answer big questions at scale

Rank markets for future action, see how much capital new generation will actually require, and learn how parties are shaping regulatory outcomes.

Usecase 03
  • 50-state siting map
  • Approved-cost benchmarks
  • IRP position memo

Data

Real-time access to energy's regulatory record

State utility commissions

All 50 PUCs

Every state commission, plus New Orleans, DC, and Texas Railroad Commission

Grid operators

7 RTO/ISOs

CAISO, ERCOT, ISO-NE, MISO, NYISO, PJM and SPP, plus Western Power Pool.

Federal agencies

FERC, NRC, SEC

Dockets, orders and filings from three federal regulators.

Environmental agencies

Air permits

US EPA & 20+ state agencies, including Texas, Virginia, Pennsylvania, Ohio

Plus programmatic access to your Data Subscriptions

We're migrating our Data Subscriptions to Grids, which transforms them from monthly Excel-based snapshots to always-on, continuously updated market intelligence. Grids are readable through the API.

Capabilities

Build it in Halcyon, run it anywhere.

Search the record

Filter by publisher, docket, topic, filing type, date and exact phrase. Combine filters with AND, OR and NOT.

Ask questions in plain English

Put a question to a set of filings. Get the answer as prose or in a structure you define, cited to the document and page.

Pull docket and filing details

Parties, status, proceeding type, filing dates and summaries, each with a link to the source in Halcyon.

Read what your Alerts found

Alerts are persistent queries that run on a schedule. Send their findings to a feed, a channel or a ticket queue.

Read Grids cell by cell

Every value comes with its citation, whether a person verified it, and a history of how it changed.

Download Data Subscriptions

For the Data Subscriptions that aren't yet Grids, you can use the API to download the latest tracker releases.

Saved Searches, Queries, Alerts, Grids and Projects your team sets up in the app are readable through the API.

The full endpoint reference lives at api.halcyon.io.

Get access

What will your team build with the Halcyon API?

Tell us the market, docket or workflow you have in mind. We’ll show you how to get there.

Get API access Read the docs

Already a customer? Ask your Halcyon account team to add API access.